Myrm wrote:But how do I shoot? How do I collect? I press the fire button on my joystick and nothing happens.
Check your control mappings, the SRV has it's own set of mappings in the settings menu under controls.
When you find a thing, for example an outcrop, target it and shoot it, deploy the cargo scoop on the SRV, target the thing you want to pick up and drive over it.
You are not limited to the number of materials you collect (up to the 600 you can have), but you can only carry two cargo canisters.